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std::basic_string::find — cppreference.com

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size_type find( const basic_string& str, size_type pos = 0 ) const;

 (1)

size_type find( const CharT* s, size_type pos, size_type count ) const;

 (2)

size_type find( const CharT* s, size_type pos = 0 ) const;

 (3)

size_type find( CharT ch, size_type pos = 0 ) const;

 (4)

Trouve la première chaîne égale à la séquence de caractères donnée. La recherche commence à pos, à savoir la sous-chaîne trouvée ne doit pas commencer dans une position précédant pos .

Original:

Finds the first substring equal to the given character sequence. Search begins at pos, i.e. the found substring must not begin in a position preceding pos.

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1)

Trouve la première chaîne égale à str .

Original:

Finds the first substring equal to str.

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2)

Trouve la première chaîne à la hauteur des caractères count premiers de la chaîne de caractères pointée par s. s peuvent inclure des caractères nuls .

Original:

Finds the first substring equal to the first count characters of the character string pointed to by s. s can include null characters.

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3)

Trouve la première chaîne égale à la chaîne de caractères pointée par s. La longueur de la chaîne est déterminée par le premier caractère null .

Original:

Finds the first substring equal to the character string pointed to by s. The length of the string is determined by the first null character.

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4)

Trouve le premier caractère ch .

Original:

Finds the first character ch.

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Paramètres

str -

chaîne à rechercher

Original:

string to search for

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count -

longueur de chaîne à rechercher

Original:

length of substring to search for

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s -

pointeur vers une chaîne de caractères pour seach

Original:

pointer to a character string to seach for

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ch -

de caractères à rechercher

Original:

character to search for

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Retourne la valeur

la position du premier caractère de la chaîne trouvée ou npos si aucune sous-chaîne ne soit trouvé .

Original:

position of the first character of the found substring or npos if no such substring is found.

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Exemple

#include <string>
#include <iostream>

void print(std::string::size_type n, std::string const &s)
{
    if (n == std::string::npos) {
        std::cout << "not found\n";
    } else {
        std::cout << "found: " << s.substr(n) << '\n';
    }
}

int main()
{
    std::string::size_type n;
    std::string const s = "This is a string";

    // search from beginning of string
    n = s.find("is");
    print(n, s);

    // search from position 5
    n = s.find("is", 5);
    print(n, s);

    // find a single character
    n = s.find('a');
    print(n, s);

    // find a single character
    n = s.find('q');
    print(n, s);
}

Résultat : 

found: is is a string
found: is a string
found: a string
not found

Voir aussi

trouver la dernière occurrence d'une chaîne

Original:

find the last occurrence of a substring

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(fonction membre publique) [edit]

trouver la première occurrence des caractères

Original:

find first occurrence of characters

The text has been machine-translated via Google Translate.
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(fonction membre publique) [edit]

trouver la première absence de caractères

Original:

find first absence of characters

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.


(fonction membre publique) [edit]

trouver la dernière occurrence de caractères

Original:

find last occurrence of characters

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.


(fonction membre publique) [edit]

trouver une dernière absence de caractères

Original:

find last absence of characters

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.


(fonction membre publique) [edit]